Method of adjusting rotary cutters.



. S. MAUKAY. METHOD OF ADJUSTING ROTARY GUTTBRS. .APPLIOATIOE FILED AUG. 16, 1911.

1,979,420.. Patented Nov. 25, 191gl 'MEETS-ammi;y

S. MAOKAY. METHOD OP ADJUSTING ROTARYUGUTTERS.

APPLICATION FILED AUG. 16, 1911.A

' A Patented Nov. 25, 1913.

\ 2 SHEETS-SEEET 2.

new

- chine.

4UNITED STATES -irarinwr OFFICE.

`sIMoN Mackay, or Arnon, MASSACHUSETTS, AssrGNon. To 'UNION TwIsT DRILL COMPANY, 0F ATHOL, MASSACHUSETTS, A' CORPORATION 0F MASSACHUSETTS.

f METHOD or ADJSTING nor-.uw cUTTEns.

Specification of matters Patent.

Patented Nov. 25, 1913.

Application tiled August 16, 1911. Serial o. 844,445.

To all 'whom t may concern:

Beit known that I, SIMON MAGKAY, a citizen of the United States, residing at Athol, Massachusetts, halve invented certain and useful Improvements in Methods of Adjusting Rotary Cutters, of which the following is a specification.

This invention relates to the adjustment of aI milling cutter or like tool having teeth formed with radial relief on their outer or peripheral edge and having their forward or g'cutting edge radial or substantially ragial.

n my 'prior application,l Serial No. 574,345, I 5set forth a combination of my gaging device with a certain grinding ma- In my present invention, while I yshall show as illustrative embodiment the same form of gage and machine, 4I shall deal with the method of accomplishing this result, employing the specific device which I havemheretofore shown merely as a means of illustration of the manner in which I ac-` complish the results sought.

1'Ihe particular result desired to be effected in 'grinding a milling cutter or other device of'this sort is the removal of a certain predetermined depth on the face ofthe tooth and the removal of that depth by successive girindings. In other words, itis greatly desired to" grind away with absolute accuracy the predetermined-amount of each tooth and to accomplish this by successive operations and all under the control of a gage in which while absolutely accurate may be accomplished in a simple manner and at a single setting or adjustment.

'1A-vo those skilled in the art, the practical diiijculties of ordinary cutter tooth grinding willbe well understood. The art of gaging the length of the tooth by a movable gage in contact with the relieved gage of the outer face of the tooth is also well understood but in my invention it must be remembered that instead lot' gaging the length of the tooth which isto be ground, I am gaging a lateral l distance, to wit, the depth to which the face of the tooth is to be ground, that is,

the gaging or grinding is not lengthwise or toward its center but circumferentially or from front to rear of the tooth. If then'it be borne in mind that while I apply the gage to the relieved peripheral tooth, I am actually measuring the front and rear adjustment by which a predetermined amount of the cutting of the face of the tooth is presented to be ground away. It will be seen that my method involves a wholly new manner of `dealing with the grinding proposition. The gist of my invention lies in a gaging by which a predetermined setting movement of the face of the tooth relative tothe grinding face of the wheel is accom- ,fplished by a gaging of the eccentricity of the Outer edge of the tooth; in other words by the gaging of its radial relief. The advantages of my method will appear further in detail as more at length in my specification.

Throughout specification and drawings like reference numerals are employed to' indicate corresponding parts and in the drawlugs:

Figure l is a diagrammatic view showing a portion of the grinding wheel, a portion of the.. cutter and an indicator arm set in the initial step of my method. lar view showing the tooth adjusted and wheel and cutter separated. Fig. 3 is a still fiirthcr view showing the grinding wheel making a partial cut clown toward an indicated limit. :Fig 4 is a. view showing the position of the toothand grinding wheel Fig. 5 -is'a side View adaptcdlfor the pracand Fig; 6 1s a plan after grinding. Jgrinding machine of my invention y of the' same. v

Referring to the drawings I have indicated clusive, I have shown in conjunction with with regard to the indication thereofbcfore at X a fragnxent of the periphery of a mill- I discuss the matter.

se arated.

. my prior application controlled by a sive Wheel 10.

i adjacent' to this o the cutter which is understood to be ro-` tatably mounted as shown in'Fig. 6, a por tion of the grinding Wheel indicated at 10v and the indicating lever 18. In order to understand the purpose of my invention I will 'first describe the adjustment of the tooth of the cutter X relative to the grinding wheel 110. In Fig. 1 it is supposed that the underground' tooth of, the cutter X. is brought up against the face of the grinding wheel 10. In this adjustment the-grinding wheel 1() and the cutter X are moved at .right angles ,to eachother. This is the po sit-ion indicated in full lines in Fig. 4t and in that position the point of the indicator 20 is preferably set at zero. As shown in Fig. 2 the cutter X and the Wheel 10' are The particular means of accomplishingthese relative movements in my preferred machine will be more fully described lafter on. In Fig. 2 I have also shown the tooth of the cutter advanced to secure a predetermined epth of eut which is indicated by dotted lines. The position of the tooth of the cutter X in this position is shown in Fig. 4 in dotted lines. In Fig. 4. it

iwillwbe seen that the indicator point which was set at zero for the rst adjustment of the tooth tothe wheel prior to grindingl shows a reading of two one-thousandths which is the exact amount of the eut desired to be made in sharpening. In Figs. 5 and 6 I have shown the particu-A lar forugof grinding machine set forth in above referred to. In

order to make clear the exact practice of my invention as Itshall hereafter describe 1I shall make particularV reference to this form. The machine consists of a suitable pedestal 1 providedv with a lateral bracket 2 upon which is supported a slide 4 controlled by the milled knob 5. '6 is a cross slide, also knob. 7 and on, this is sup- -ported in suitable, bearings,y 8 a` spindle 9 upon the yhead of which is mounted an abra- The wheel 10 is covered by a hood 11 .whichis open on one side-and ning is a work supporting slide 12 lmova ly mounted on a bracket' Power is' applied to the machine through a .the plate.

13 and controlled by, a milled knob 14. 15 is a plateadjustable on the slide 12 by a set screw 16 which passes through a slot on Near the end of the plate is a screw stud 17 upon which is vcentered a cutter, as indicated at X. Just, in advance/ f the cutter centering stud 17 is pivotally vmounted 'a gaging lever 18 which at its forwardend. 18 is formed with atooth engaging point and atits rearward end 182v engages the'actuating rod19 of an adjustable spring multiplying indicator 20.

pulley 21 Fixe on a disk spindle 9.

,been properly t'rued dial until the pointer reads on zero. A

drawn hack the cutter is rotated to the vwheel drawn back by the tooth.

Theoperationof my device is as followsf;

It is supposed that the emery wheel 10 has oit on its front face and is in condition to accurately grind the face of a tooth. A suitable plate- 15 is selected which has a stud 17' of the right diameter to fit the putter to be sharpened and with the cutter clamped on the stud the plate 15 is so adjusted that the teeth of the cutter, when in contact with the gage lever 18 .will move the lever slightly away from a stop pin 18a which is set 1n the forward end of the slide. The plate 1.5 is then clamped through the thumb screw 16. The einer wheel `10 is then adjusted by the milled liinob 7 so that it will come to they bottom of the tooth of thev cutter X when the slide, 12 is moved forward to thc limit of its m0tion. With the emery wheel 10 at rest the face of the tooth is brought into contact with the;, wheel` vlate 15 at' the so as to bring the y he screw is then loosened-slightly7 to release the cutter X on the plate'iand with thev slide 13 and the cutterI is clamped upon the" by the screw 17 It is preferable t indicator 2O be adjustable,

until the indicator pointershows a movenient ot one or two thousandths'of an inch which is usually the amount of grinding desired. l IThe cutter is then clam ening the screw 17 `and the in( icator ydialis brought again-to zero. With the emery turning the knob5`so that it will clear the cutter tooth the knob forth past the cessive` slight turns on the knob 5 until' the proper amount, that is,` one orltwo thousandths, has been removed from the faceof The 'slide 13 is then drawn back, and-the cutter loosened and turned until the indicator reads on zero `with the end18of the lever 18- in contact with the next-.tooth which is then ground in the same manner as that just described..- In this 'way it will 'be' seen that each. tooth Ais ound with absolute accuracy on substantie. ly a radial line and each tooth will have an absolute uniform length.

Various modifications may obviousl be made in the structure and operation o .my device, all without departing from the s irit of my invention if within the limits o ,the appended claims. 3 'f What I therefore claim and desire. to secure by Letters Patent is: A

1. The method of grinding a radiallyrelieved milling cutter, consisting 'in estab# lishing' a predetermined relative feed movement of cutter and grinding-wheel, in setting the 'forward face of a tooth to be round against the face. of the grinding sur ace of said wheel, in separating said cutter ,und

left

ed by tight- 14 is turned to move the slide 13 back and face of the emery wheel and the emery wheel isitsclfadvanced by sucsaid Wheel, n advancing the face of sai; the grineiby'conmct of a measuring device l0 cutter past the plane of said face griming with the ireieved periphery of a toot-h.

surface in said wheel a predeermined In esstimonj; whereof l dfix my sigmuureamount, as indicated by a gage applied to in presence 0f tw@ witnesses.

the outer edge of the tooth.

i i f 2. The metho of setting a rotary tooth 'EMB MACAAYY cntter'for grinding which consis'ts nassen Witnesses: llully 1n determining the proper circumfer JOHN W) Box'rN'roN,

ential adjustment 01 the cutter I'elaive to HARRY v. Hmmm. f 

